\begin{table}[!h]
\centering
\caption{Minimum Sample Size (MSS) Needed for 80\% Power By Proportional Change in Treatment Effect ($\gamma$) Based on Wave 1 Treatment}
\centering
\begin{tabular}[t]{crrrr}
\toprule
\multicolumn{1}{c}{ } & \multicolumn{2}{c}{Fox} & \multicolumn{2}{c}{MSNBC} \\
\cmidrule(l{3pt}r{3pt}){2-3} \cmidrule(l{3pt}r{3pt}){4-5}
$\gamma$ & MSS & 95\% CI Lower Bound & MSS & 95\% CI Lower Bound\\
\midrule
\cellcolor{gray!10}{1.25} & \cellcolor{gray!10}{583022} & \cellcolor{gray!10}{22500} & \cellcolor{gray!10}{2516473} & \cellcolor{gray!10}{26941}\\
1.50 & 145755 & 15718 & 629118 & 22126\\
\cellcolor{gray!10}{1.75} & \cellcolor{gray!10}{64780} & \cellcolor{gray!10}{11597} & \cellcolor{gray!10}{279608} & \cellcolor{gray!10}{18495}\\
2.00 & 36439 & 8907 & 157280 & 15689\\
\cellcolor{gray!10}{2.25} & \cellcolor{gray!10}{23321} & \cellcolor{gray!10}{7055} & \cellcolor{gray!10}{100659} & \cellcolor{gray!10}{13477}\\
\addlinespace
2.50 & 16195 & 5726 & 69902 & 11702\\
\cellcolor{gray!10}{2.75} & \cellcolor{gray!10}{11898} & \cellcolor{gray!10}{4740} & \cellcolor{gray!10}{51357} & \cellcolor{gray!10}{10255}\\
3.00 & 9110 & 3988 & 39320 & 9061\\
\cellcolor{gray!10}{3.25} & \cellcolor{gray!10}{7198} & \cellcolor{gray!10}{3402} & \cellcolor{gray!10}{31068} & \cellcolor{gray!10}{8065}\\
3.50 & 5830 & 2937 & 25165 & 7224\\
\addlinespace
\cellcolor{gray!10}{3.75} & \cellcolor{gray!10}{4818} & \cellcolor{gray!10}{2560} & \cellcolor{gray!10}{20797} & \cellcolor{gray!10}{6508}\\
4.00 & 4049 & 2252 & 17476 & 5893\\
\bottomrule
\end{tabular}
\end{table}
